Terahertz imaging method based on spiral phase contrast imaging and device

A technology of terahertz imaging and phase contrast imaging, which is applied in the field of terahertz quasi-optical imaging, can solve the problems of low contrast and small difference between terahertz transmission/reflectivity, etc., achieve high-contrast imaging, and realize terahertz high-contrast imaging , Realize the effect of real-time imaging
CN110811615AInactive Publication Date: 2020-02-21INST OF ELECTRONICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF ELECTRONICS CHINESE ACAD OF SCI
Publication Date
2020-02-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a terahertz imaging method based on spiral phase contrast imaging and a device. The terahertz imaging method includes the following steps: a collimated terahertz wave beam is subjected to target transmission to obtain a first transmission wave beam; after the first transmission wave beam is travelled for a distance f, modulation is performed by using a first lens to obtain asecond transmission wave beam; after the second transmission wave is travelled for a distance f, modulation is performed by using a spiral phase plate located on a frequency spectrum plane to obtaina third transmission wave beam; after the third transmission wave beam is travelled for a distance f, modulation is performed by using a second lens to obtain a fourth transmission wave beam; and after the fourth transmission wave beam is travelled for a distance f and received by a terahertz camera, imaging is realized. The method introduces the spiral phase contrast imaging technology into terahertz imaging, and the spiral phase contrast imaging can realize the characteristic of high contrast imaging, so that the terahertz high contrast imaging is realized.
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Description

technical field

[0001] The invention relates to the technical field of terahertz quasi-optical imaging, in particular to a terahertz imaging method and device based on spiral phase contrast imaging. Background technique

[0002] Terahertz waves have a certain penetrating ability to biological tissues, and the single photon energy is low, and will not cause ionization of biological tissues. It is very safe in biomedical imaging and is suitable for biomedical imaging. However, the contrast of terahertz biomedical images is often very low, mainly due to the high water content of biological tissues, water has a strong absorption of terahertz waves, and some different types of biological tissues have little difference in the transmission / reflection of terahertz. Therefore, there is an urgent need to study terahertz high-contrast imaging methods. Spiral phase-contrast imaging technology is widely used in optical imaging. Compared with common imaging methods, spiral phase-contrast...

Claims

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